DIffusion, Osmosis and Active Transport Flashcards
What is diffusion?
The net movement of particles from an area of higher concentration to an area of lower concentration.
How does diffusion apply to photosynthesis?
- Carbon dioxide and water diffuse into the leaf to start photosynthesis.
- Because the concentration of oxygen will be higher inside the leaf than outside after photosynthesis, it diffuses out of the leaf.
Where does diffusion occur in the leaf?
In the pores on the underside of the leaf.
What is osmosis?
The diffusion of water molecules from a region of higher water concentration to a region of lower water concentration through a partially permeable membrane.
When does osmosis stop?
When the water concentration is equal.
Why can water pass through a partially permeable membrane?
Because its molecules are small enough to pass through.
What is active transport?
The transport of particles from lower to a higher concentration. This process is active because it requires energy in the form of ATP.
What is special about active transport?
It goes against the concentration gradient.
What do root hair cells allow plants to do?
Absorb the nutrients from fertilisers.
What do root hair cells do?
- Absorb water by osmosis
2. Absorb mineral ions by active transport.
How are root hair cells adapted to their function?
They have hair-like protrusions to increase their surface area to volume ration for absorption.
